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Appendix E
USB 2.0 Limitations
The following information covers the currently known limitations associated with
operating under the USB 2.0 interface.
• Maximum cable length is 5 meters (16.4 feet)
• 1 MHz is currently the upper digitization rate limit for the ST-133 Controller.
• Large data sets and/or long acquisition times may be subject to data overrun
because of host computer interrupts during data acquisition.
• USB 2.0 is not supported by the Princeton Instruments PC Interface Library (Easy
DLLS).
• Some WinView/WinSpec 2.5.X features are not fully supported with USB 2.0.
See the table below.
Feature Supported with USB 2.0 in
WinX 2.5.X
Remarks
Demo Port Capability NO
DIF NO
Kinetics YES WinX 2.5.18.1
Reset Camera to NVRAM
Defaults
NO
Temperature Lock Status YES WinX 2.5.x doesn’t utilize
hardware lock status
PTG YES
Virtual Chip NO
Custom Timing YES WinX 2.5.18.1
Custom Chip YES WinX 2.5.18.1
Frames per Interrupt NO
RS170 (Video Output) NO
Online Exposure NO
File Information YES Not all header info is
currently available in
WinX 2.5.x through
PVCAM
Overlapping ROIs NO
Table 19. Features Supported under USB 2.0 (continued on next page)